If your numbers keep surprising you, start by measuring what is always on. That is usually where the hidden drain sits.
On many narrowboats, one small “always-on” category can consume more than occasional high-power loads.
Easy way to map your day
- Always-on loads: fridge, routers, standby electronics.
- Daily variable loads: lights, pumps, laptops, TV.
- Short high-power loads: kettle, microwave, tools, hair dryer.
Keep it realistic
- Compare your planner numbers against real monitor data monthly.
- Adjust runtime assumptions first, not just watt labels.
- Add seasonal adjustments so winter does not catch you out.
The goal is not perfection. The goal is confidence that your setup can handle normal life without constant battery anxiety.
Use the Off-Grid Planner to run this with your own setup.